公开(公告)号：US20190140547A1

公开(公告)日：2019-05-09

申请号：US16241964

申请日：2019-01-07

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuang-Fu Chang ,  Tzu-Chen Lin

IPC: H02M3/335 ,  H02M1/32

Abstract: The present invention discloses a power converter, a switch control circuit, and a short circuit detection method for current sensing resistor of the power converter. The power converter includes: a transformer, a power switch, a current sensing resistor and a switch control unit. The current sensing resistor has one end coupled to the power switch and another end coupled to ground. The switch control unit generates the operation signal to control the power switch. The switch control unit generates a first sample-and-hold voltage at a first time point and a second sample-and-hold voltage at a second time point according to a voltage across the current sensing resistor. When a voltage difference between the first sample-and-hold voltage and the second sample-and-hold voltage is smaller than a reference voltage, it is determined that a short circuit occurs in the current sensing resistor.

公开(公告)号：US20160268908A1

公开(公告)日：2016-09-15

申请号：US15052444

申请日：2016-02-24

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuang-Fu Chang ,  Tzu-Chen Lin

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/0009

Abstract: The present invention discloses a power converter, a switch control circuit, and a short circuit detection method for current sensing resistor of the power converter. The power converter includes: a transformer, a power switch, a current sensing resistor and a switch control unit. The current sensing resistor has one end coupled to the power switch and another end coupled to ground. The switch control unit generates the operation signal to control the power switch. The switch control unit generates a first sample-and-hold voltage at a first time point and a second sample-and-hold voltage at a second time point according to a voltage across the current sensing resistor. When a voltage difference between the first sample-and-hold voltage and the second sample-and-hold voltage is smaller than a reference voltage, it is determined that a short circuit occurs in the current sensing resistor.

Abstract translation: 本发明公开了一种电力转换器的电流检测电阻器的功率转换器，开关控制电路和短路检测方法。 电力转换器包括：变压器，电源开关，电流检测电阻和开关控制单元。 电流检测电阻器的一端耦合到电源开关，另一端耦合到地。 开关控制单元产生操作信号以控制电源开关。 开关控制单元根据电流检测电阻器两端的电压在第一时间点产生第一采样保持电压和第二时间点的第二采样保持电压。 当第一采样保持电压和第二采样保持电压之间的电压差小于参考电压时，确定在电流感测电阻器中发生短路。

公开(公告)号：US20170338746A1

公开(公告)日：2017-11-23

申请号：US15290771

申请日：2016-10-11

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Yu-Kai Chen ,  Kuang-Fu Chang

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/00

CPC classification number: H02M3/33592 ,  H02M1/08 ,  H02M1/32 ,  H02M3/33507 ,  H02M2001/0009

Abstract: The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. The power converter senses the output current by a current sensing resistor to generate first information which relates to the output current. The power converter generates second information according to an ON time, an OFF time or a switching period of the power switch, or according to an energy-releasing period for transmitting energy to the output terminal, wherein the second information indicates whether there is a substantial amount of energy transmitted to the output terminal. By checking whether the first information and the second information are contradictory to each other, a malfunction can be found.

公开(公告)号：US20160352232A1

公开(公告)日：2016-12-01

申请号：US15153436

申请日：2016-05-12

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuang-Fu Chang

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33523 ,  G06F1/26 ,  G06F1/263 ,  G06F1/266 ,  G06F1/28 ,  H02M2001/0025 ,  H02M2001/0032 ,  Y02B70/16

Abstract: The present invention provides a power converter, and a control circuit and a standby power saving method thereof. The power converter provides an output voltage from an output terminal through an enable switch circuit to a power receiver. A detection signal shows whether a voltage at a signal transmission pin of the power converter is in a predetermined range, if not, the enable switch circuit is turned OFF. The power converter adjusts a feedback signal according to the detection signal or according to the detection signal and the output voltage, so as to adjust the output voltage to be lower than a normal operation level in a normal operation mode, to save power in a standby mode.

Abstract translation: 本发明提供一种功率转换器及其控制电路及其备用省电方法。 功率转换器通过使能开关电路向输出端提供输出电压至电力接收器。 检测信号表示功率转换器的信号传输引脚上的电压是否处于预定范围内，否则使能开关电路断开。 功率转换器根据检测信号或根据检测信号和输出电压来调整反馈信号，以便在正常操作模式下将输出电压调整为低于正常工作电平，从而将电源节省在待机状态 模式。

公开(公告)号：US20160105116A1

公开(公告)日：2016-04-14

申请号：US14879175

申请日：2015-10-09

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuang-Fu Chang ,  Tzu-Chen Lin ,  Chien-Fu Tang

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M2001/0032

Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.

Abstract translation: 本发明提供具有可编程输出和控制电路的回扫功率转换器及其控制方法。 回扫功率转换器根据设置信号将输入电压转换为可编程输出电压，其中可编程输出电压在不同电平之间切换。 反激式功率转换器包括：变压器电路，功率开关电路，电流检测电路，光耦合器电路和控制电路。 控制电路根据可编程输出电压的电平自适应地调整操作信号，以在可编程输出电压切换到相对较低的电平时维持操作信号的相同或相对较高的操作频率，以便保持相位裕度 同时提供相同的输出电流。